okay, I read that for abs (main focus next to chest), the three things you need is good cardio, diet, and training. So thats running (gettin cold

), eating right (need some help there lol), and problably crunches (I hear theyre better than situps). I also read from another source that weighted crunches are better than regular ones...more weight (such as a dumubell) and less reps. They compared it to bicep curls. They said "would you do 50 bicep curls with no weight? No, then why would you do crunches with body weight?"
So I'm confused with those...and I really need some more abdominal exercises and some guidance
As for chest...push ups, bench press, rows, chest press (sitting), and maybe a few dips?
And legs...I tried the squats...but I need a spotter, and its really uncomfortable (I know im complaining lol) and other than running (ties in with abs) is there anything else to build mass on the legs?
ARMS
Dumbells, pushups??<---need some more there
finally shoulders and back...
people have told me that abs are nothing without a strong back to match it...true?
are back arches really worth it? cause theyre annoying and I hardly feel any burn after lots of reps...also need some more exercises there...but back's like last priority
shoulders...everything works shoulders riiiight?....help
um so yea any help would be appreciated, thanks all of you guys for takin the time =)
NOTE: on the abs, I have a clear 4-6 pack...depends on what is in my tummy lol...but the most defined abs are the highest ones (that make the 8 pack) and the lowest abs are barely visible...normal? any exercises to get the lowest abs?